/* Copyright (c) 2011-2017, NVIDIA CORPORATION. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of NVIDIA CORPORATION nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <classical/strength/strength_base.h>

namespace amgx
{

template <class T_Config>
class Strength_Ahat : public Strength_Base<T_Config>
{
        typedef T_Config TConfig;
        typedef typename TConfig::MatPrec ValueType;
        typedef typename TConfig::IndPrec IndexType;
    public:
        Strength_Ahat(AMG_Config &cfg, const std::string &cfg_scope) : Strength_Base<T_Config>(cfg, cfg_scope) {}
        __host__ __device__
        bool strongly_connected(ValueType val, ValueType threshold, ValueType diagonal)
        {
            //return (diagonal<0.0) ?  val>threshold : val<threshold;
            return  -val >= -threshold;
        }
};

template<class T_Config>
class Strength_Ahat_StrengthFactory: public StrengthFactory<T_Config>
{
    public:
        Strength<T_Config> *create(AMG_Config &cfg, const std::string &cfg_scope) { return new Strength_Ahat<T_Config>(cfg, cfg_scope); }
};

} // namespace amgx


